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Дисертації з теми "Lepton number"

Автор: Grafiati

Опубліковано: 14 березня 2023

Оновлено: 25 липня 2025

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1

Gibbs, M. J. "Baryon and lepton number violation at supercolliders." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338254.

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2

Lucas, Vincent Alfred. "Baryon number and individual lepton number violation in supersymmetric SO(10) grand unification theories /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487946776022361.

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3

Pagé, Véronique. "Aspects of the cosmology of right-handed sneutrinos without lepton-number violation." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2320/.

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Анотація:

In this work we add a Dirac right-handed neutrino superfield to the Minimal Supersymmetric Standard Model (MSSM). We discuss the interactions of the right- handed (RH) sneutrino and its mixing with its left-handed counterpart. We study the possibility of this RH sneutrino to be the lightest supersymmetrie particle (LSP). We obtain that this dark matter candidate is a non-thermal relic, and generally has a small relic density. This we argue makes it an interesting candidate for addressing the Ω(_DM)/ Ω(_b) problem. We then discuss a lepton-number conserving leptogenesis scenario, in which an Af

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4

Senami, Masato. "Lepton-number asymmetry generation via multiscalar field evolution in supersymmetric electroweak models." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/59324.

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5

Colón, Samuel Santana. "Phenomenological model combining flavor symmetry violation and lepton number violation in neutrino physics." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3334993.

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6

Ciezarek, Gregory. "Searches for lepton number violation, and flavour violation beyond the Yukawa couplings at LHCb." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25052.

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The Standard Model does not describe several phenomena, such as gravity and dark matter, and therefore is an incomplete description of nature. This demands the existence of new physics beyond the Standard Model. Two searches for new physics are presented in this thesis, along with a sensitivity study for a third analysis sensitive to new physics. The vMSM model motivates a search for lepton number violation using B+ -> h- μ+ μ+ decays, where h = (pi, K). No B+ → h- μ+ μ+ candidates are seen in ~ 36 pb -1 of LHCb data and limits are set of BR (B+ → K- μ+ μ+) < 4.1 x 10 -8 and BR (B+ → pi- μ+ μ+

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7

Hemmer, Sabine. "Study of Lepton Number Conserving and Non-Conserving Processes Using GERDA Phase I Data." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424596.

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The GERmanium Detector Array (GERDA) experiment, located underground at the INFN Laboratori Nazionali del Gran Sasso (LNGS) in Italy, uses high-purity germanium detectors to search for neutrinoless double beta decay (0νββ) of Ge-76. The first phase of the experiment lasted from November 2011 to May 2013 and collected data with a total exposure of 21.6 kg · yr. In this thesis, a thorough analysis of these data was performed. A background model was developed to decompose the observed energy spectrum in its individual contributions. The region around the Q-value of 0νββ, Qββ , at 2039 keV was s

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8

Dürr, Michael [Verfasser], and Manfred [Akademischer Betreuer] Lindner. "Phenomenological Aspects of Theories for Baryon and Lepton Number Violation / Michael Dürr ; Betreuer: Manfred Lindner." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177810506/34.

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9

Massri, Karim. "Kaon identification and search for lepton number violation in K± decay-in-flight experiments at CERN." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5451/.

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A search for the Lepton Number Violating decay \(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\) has been performed using the data collected by the NA48/2 experiment in 2003 and 2004. The signal event selection, the background rejection, the evaluation of the muon identification efficiency and the statistical methods used for the data interpretation are presented. Based on 1.8 x 10\(^1\)\(^1\) kaon decays in the fiducial volume and using several models for the signal, upper limits for the branching ratio \(B\)(\(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\)) of the order of 10\(^-\)\(^1\)\(^0\)

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10

Coulter, Ian T. "Modelling and reconstruction of events in SNO+ related to future searches for lepton and baryon number violation." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:495395b3-bf15-4c9b-851d-c13e7dad8a22.

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SNO+ is a liquid scintillator experiment whose physics goals include measurements of solar neutrinos, reactor anti-neutrinos, geo neutrinos and double beta decay. During an initial water phase, it will also search for invisible modes of nucleon decay. This thesis investigates methods of improving the detector's sensitivity to the baryon and lepton violating processes of neutrinoless double beta decay and invisible nucleon decay. It does this through an improved scintillator model, allowing the sensitivity of the detector with different loading techniques to be evaluated, through a new backgrou

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11

Harrison, Jonathan Robert. "Radiation damage studies in the LHCb VELO detector and searches for lepton flavour and baryon number violating tau decays." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/radiation-damage-studies-in-the-lhcb-velo-detector-and-searches-for-lepton-flavour-and-baryon-number-violating-tau-decays(6a639716-f396-44b8-a509-61e309454d3d).html.

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This thesis presents work carried out using data from the LHCb experiment during the first three years of data taking, 2010 - 2012. A study of the effects of radiation damage on the silicon sensors of the LHCb Vertex Locator is performed, with an emphasis on the implications for the long term performance of the detector. Following three years of operation the sensors have received a maximum delivered neutron equivalent fluence of approximately 1.6E12 per square centimeter, leading to a number of radiation induced effects. In particular the change in charge collection efficiency and signal/nois

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12

Zeißner, Sinan [Verfasser], Heinrich [Akademischer Betreuer] Päs, and Emmanuel [Gutachter] Stamou. "Baryogenesis originating from lepton number violation induced by right-handed Majorana neutrinos / Sinan Zeißner ; Gutachter: Emmanuel Stamou ; Betreuer: Heinrich Päs." Dortmund : Universitätsbibliothek Dortmund, 2021. http://d-nb.info/1238349773/34.

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13

Lehnert, Björn. "Search for 2nbb Excited State Transitions and HPGe Characterization for Surface Events in GERDA Phase II." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199454.

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Анотація:

The search for the neutrinoless double beta (0nbb) decay is one of the most active fields in modern particle physics. This process is not allowed within the Standard Model and its observation would imply lepton number violation and would lead to the Majorana nature of neutrinos. The experimentally observed quantity is the half-life of the decay, which can be connected to the effective Majorana neutrino mass via nuclear matrix elements. The latter can only be determined theoretically and are currently affected by large uncertainties. To reduce these uncertainties one can investigate the well es

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14

Lehnert, Björn. "Search for 2nbb Excited State Transitions and HPGe Characterization for Surface Events in GERDA Phase II." Doctoral thesis, Physics Letters B 705 (2011) 47–51; Physical Review C 87, 034312 (2013) 034312-1-034312-8, 2015. https://tud.qucosa.de/id/qucosa%3A29299.

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Анотація:

The search for the neutrinoless double beta (0nbb) decay is one of the most active fields in modern particle physics. This process is not allowed within the Standard Model and its observation would imply lepton number violation and would lead to the Majorana nature of neutrinos. The experimentally observed quantity is the half-life of the decay, which can be connected to the effective Majorana neutrino mass via nuclear matrix elements. The latter can only be determined theoretically and are currently affected by large uncertainties. To reduce these uncertainties one can investigate the well es

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15

Lucente, Michele. "Implication of Sterile Fermions in Particle Physics and Cosmology." Doctoral thesis, SISSA, 2015. http://hdl.handle.net/20.500.11767/4803.

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The neutrino mass generation mechanism, the nature of dark matter and the origin of the baryon asymmetry of the Universe are three compelling questions that cannot be accounted for in the Standard Model of particle physics. In this thesis we focus on all these issues by providing a possible solution in terms of a minimal extension of the Standard Model, consisting in the addition of a set of sterile fermions to the field content of the theory. Sterile fermions are gauge singlet fields, that can interact via mixing with the active neutrinos. We focus on the Inverse Seesaw mechanism, which is ch

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16

Aponte, Diego Alejandro Cogollo. "Quebra espontanea da simetria leptônica no modelo 3-3-1 com neutrinos de mão direita." Universidade Federal da Paraíba, 2009. http://tede.biblioteca.ufpb.br:8080/handle/tede/5771.

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Анотація:

Made available in DSpace on 2015-05-14T12:14:18Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 939261 bytes, checksum: f8a1456cf29d5789dabc615e68c9a352 (MD5) Previous issue date: 2009-08-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The standard model does not predict mass for the neutrinos, and any evidence that neutrinos are massive particles is a signal of new physics. Recent experimental data on neutrino oscillations provide a convincing evidence that neutrinos are massive and very light particles, with mass in the scale of eVs. Thus, we must extend t

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17

Dyndal, Mateusz. "Two-Photon Interactions in Proton-Proton Collisions with the ATLAS Experiment at the LHC." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112186/document.

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Анотація:

Cette thèse présente la première mesure de la section efficace exclusive photon-photon-> di-leptons en collisions proton-proton à une énergie dans le centre de masse de 7 TeV dans l'expérience ATLAS au LHC. La mesure est réalisée avec toutes les données accumulées en 2011, pour une luminosité intégrée de 4.6/fb. La première partie de la thèse est dédiée à la description théorique de ce type d'interaction. Le calcul de l'amplitude de la réaction photon-photon-> di-leptons est bien connu dans le cadre du modèle standard de la physique des particules. Cependant, une complication apparaît au

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18

Bellavance, Angela M. "KTeV E799II search for the lepton-flavor-number violating decay kaon(long) going to neutral pion charged muon charged electron." Thesis, 2000. http://hdl.handle.net/1911/17323.

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Experiments E799 Phase-II (E799II) and E832 of the Kaons at the TeVatron (KTeV) project at the Fermi National Accelerator Laboratory (Fermilab), are in the process of studying rare and CP-violating kaon decays. The experiment ran during 1996 and 1997, and the resulting data are being analyzed. This study focuses on the E7991I search for the decay mode KL→p0m+/- e&mnplus; , and its accompanying background decays, in approximately 60% of the 1996--7 KTeV data.

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19

Bellavance, Angela Maria. "Search for the lepton-flavor-number violating decay kaon long decays to neutral pion muon antimuon electron positron in the full E799II kaons at the TeVatron data set." Thesis, 2003. http://hdl.handle.net/1911/18509.

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Анотація:

Experiments E799 Phase-II (E79911) and E832 of the Kaons at the TeVatron (KTeV) project at the Fermi National Accelerator Laboratory (Fermilab) were designed to study rare and CP-violating kaon decays. The experiments ran first during 1996 and 1997, and then again during 1999. This study focused on the E799II search for the lepton-flavor-violating decay mode KL → pi 0mu+/-e&mnplus;, and on its accompanying background decays, in the full set of 1996--7 and 1999 KTeV data. For the combined data sets, we calculated a new 90% confidence level branching ratio limit BR(KL → pi 0mu+/-e&mnpl

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20

Iyer, Abhishek Muralidhar. "Randall-Sundrum Model as a Theory of Flavour." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3381.

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Анотація:

The discovery of the Higgs boson by the LHC provided the last piece of the puzzle neces- sary for the Standard Model (SM) to be a successful theory of electroweak scale physics. However there exist various phenomenological reasons which serve as pointer towards the existence of physics beyond the Standard Model. For example the explanation for the smallness of the neutrino mass, baryon asymmetry of the universe, the presence of dark matter and dark energy etc. are not within purview of the Standard Model. Con- ceptual issues like the gauge hierarchy problem, weakness of gravity provide some of

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21

Iyer, Abhishek Muralidhar. "Randall-Sundrum Model as a Theory of Flavour." Thesis, 2013. http://etd.iisc.ernet.in/2005/3381.

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Анотація:

The discovery of the Higgs boson by the LHC provided the last piece of the puzzle neces- sary for the Standard Model (SM) to be a successful theory of electroweak scale physics. However there exist various phenomenological reasons which serve as pointer towards the existence of physics beyond the Standard Model. For example the explanation for the smallness of the neutrino mass, baryon asymmetry of the universe, the presence of dark matter and dark energy etc. are not within purview of the Standard Model. Con- ceptual issues like the gauge hierarchy problem, weakness of gravity provide some of

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22

Arnold, Jonathan Mark. "Baryon and Lepton Numbers in Particle Physics beyond the Standard Model." Thesis, 2014. https://thesis.library.caltech.edu/8211/1/JArnold_THESIS.pdf.

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<p>The works presented in this thesis explore a variety of extensions of the standard model of particle physics which are motivated by baryon number (B) and lepton number (L), or some combination thereof. In the standard model, both baryon number and lepton number are accidental global symmetries violated only by non-perturbative weak effects, though the combination B-L is exactly conserved. Although there is currently no evidence for considering these symmetries as fundamental, there are strong phenomenological bounds restricting the existence of new physics violating B or L. In particular

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23

Dorostkar, ABBAS. "Three-Dimensional Dynamics of Nonlinear Internal Waves." Thesis, 2012. http://hdl.handle.net/1974/7693.

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Анотація:

The three-dimensional (3D) baroclinic response of Cayuga Lake to surface wind forcing was investigated using the fully nonhydrostatic MITgcm. The model was validated against observed temperature data using a hydrostatic 450 m (horizontal) grid and both qualitative and quantitative methods. The model correctly reproduces the basin-scale dynamics (e.g., seiche with horizontal mode-one period T1 = 80 h) with a basin-wide root-mean-square error of 1.9 C. Nonlinear internal surges were visualized to evolve due to (i) a wind-induced locally downwelled thermocline (wind duration Twind < T1/4), (ii) a

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